Using psd`s from photoshop

hi people ..i have a few football teampages for my football league ..each season i have to alter them so i dl gimp so i can alter them myself ...now what i cannot figure out is probably the easiest step ...when i look at the layers created ...i wanna change existing text in each layer or delete that layer and add another layer but i cant seem to get the text where i want it or leave the layer where it is since the psd is already how i want it i dunno how to change the text thats already there ..please get me started and ill see what i can do from there