Welcome uarceo!
Now that you have unlocked the bootloader, the next 2 steps to take are this:
1. Install a custom recovery.
2. Either flash superuser.zip or flash a custom rom.
Both processes are outlined in this guide:
http://androidforums.com/evo-4g-all...-rooting-gingerbread-2-3-5-dummies-guide.html

Click on the "show" button by the HTCDEV method guide.
Obviously you can skip the "unlock bootloader" as you have done that already.

Just go to step 2 "How to get recovery"
Then go to step 3 "flash the su file or flash a rom"

Just read carefully and if you have any questions, just ask...we will be here

Just be carefull when you decide to delete apps. Some are needed for the phone to function. (not the nascar app tho! )

 

Well Brian, as Ocnbrze would say to me many, many times:

Spoiler

Ninja Chop!

 

:rofl:

also i would avoid using TWRP (i'm sure newer versions might be fine, but TWRP 2.0 sort of bricked my phone.....so beware) as well as clockwork mod recovery (cwm just does not wipe well and has been known to create more problems then it is worth)

the best ones will be smelkus and amon ra 2.3

 

try a different usb cord or a different port on your computer.
I assume you have the drivers installed?
I also assume it was working fine when you unlocked the bootloader via the HTCdev site?

 

Another thread worth checking out with your computer not recognizing the usb is this:
http://androidforums.com/evo-4g-sup...-card-not-being-seen-root-non-root-users.html

 

if by manager you mean rom manager, then DO NOT USE ROM MANAGER. it will only work with cwm which i said earlier does not wipe well. so please do not use it. you should always do things manually in recovery. never allow an app to do what recovery can do you for you.