my rear tire is flat, i guess the previous owner tried to patch it up

i filled it back up w/ air hoping it would hold it for ~10 minutes which is the distance from my house to the shop but no avail, it went flat asap.
so now i need to remove the rear tire and take it to teh shop, i want to do this wed. mornign (may 31st, 2006) but i need to get the rear tire off first.
only question is...how do i go about doing that??

thanks to everyone who responds, much appriciated!!!