real easy...print your logo on a folder or similar card stock, cut the cardstock below the design at 1/2 or 3/4 inch and as wide as the pocket.
set the design over the pocket center it and mark the center of the logo with a spot of chalk.
get a thin rubber band and criss cross it on your hoop such that it crosses at the center of the hoop. Hoop your shirt with the intersection of the crossed band over the center mark of your logo mark.
lastly take a straight edge and lay it across your hoop parallel with some reference like the hoop edge, the hoop screws or other geography then eyeball the edger to the pocket line...get them parallel by eye then sew away.
Once you have the cardboard template cut and marked it is lightning fast to get the logo dead nuts.
If this is all too confusing I can post some pics.
mooseman