try installing Link2SD instead, it, too, is available from 1Mobile Market. (i think 1Mobile has all of Play Store's freebies from experience, not any missing as of yet that i know of) when asked to grant permissions do that. do not hit 'deny' by mistake! sometimes you need to reload since a delay in accepting root on program load causes it to think there is no root access and error out. then it gathers a list of your current apps installed and gives the option to install to SD card. now there is no actual SD buried into your device, what is reported as 'internal sd' is actually used as the partition for music and downloads, so use file manager (included) to browse the download folder--1Mobile has a couple of folders too where it saves APK files for downloaded/installed apps for backup i guess, and this fills up quickly, as there is only like 100MB accessible from this partition. when it fills up you will have 'download unsuccessful' alerts on the notification tray and 1Mobile's home page will appear blank when launched. Link2SD appears to work fine in my tries though, it does not see the partition only the internal and external.
Link2SD is a pretty easy app to use. you click onto a app you downloaded (NOT one of the built-ins which came with it! those are installed as 'system apps' and cannot be moved--only apps you install yourself can be moved) and then click on 'move to sd card,' when it says 'certain apps cannot be moved' as a warning, click ok, and wait. and wait. it takes forever. eventually you should see 'the operation completed successfully' and click OK
I advise also against any large games or apps. a lot of larger apps crash the device or cause it to go back to the animated 'Android' logo like it is rebooting itself. others will never open and give endless 'app is not responding do you want to close it?' pop-ups. the only large games i had working well are Pinball Arcade and Deer Hunter Challenge. the former only plays with ugly graphics, like a very low resolution with 'blurries', the latter actually plays well when overclocked to 1200MHz
i recommend installing Dolphin Mini for a web browser--so far i've tried Boat, Chrome, stock, Opera, but Dolphin Mini (NOT the HD) was the fastest. at best this tablet is for books, rather smallish games like Angry Birds, and browsing the web. it is not a performer, the battery life is horrid, and it's fragile. it was meant, i think, given the selection of games and apps pre-installed, designed for kids. like a first tablet or a 'My First Android' type device. always play near an outlet. at best i have managed four hours tops with the wifi on, screen brightness all the way down, and sound muted. the box lists 5-6 hours which is stretching it. expect that only with the wireless internet switched off
this tablet and other 'discount' bin tablets are not going to be your best introduction to Android. ever hear terms like 'Android Lag' or 'Android is so slow compared to iPhone??' these come from cheap tablets. Android is a great operating system--on the right device, but many see Android as a cheaper way out of using Apple products--however for any Android to perform you're going to pay. and close to the price of any Apple product similar. but Android runs best, and you're going to get a nicer intro to Android, on a more expensive product. this is Android's shortcoming. it is installed on the cheapest hardware no matter what, thus ruining its quality and reputation--as most phones/tablets running Android in public are at least 50% cheap discount bargains that hardly hold up under constant use. i think the term is 'fragmentation'. but if you want to learn Android and experience it properly, i highly advise on a Nexus 7--it's only priced $199 and is the best bet for your money at this point.