Help GENERAL LOCATION is wrong on FB post..

[eviehtc]

hi
when i post a comment or status update via htc mobile the location stamp has me in the wrong area....i have tried to change it but cant work out how.....when i am doing a status update or comment i click the X next to the location but i cant figure how to add a permenant one after that it just offers me to add where am i..i hope someone understands what i am on abuot !! and can help me