Band signings are free at warped tour. You just drop by the bands tent to see the time and place of the signing. Get there early because after a certain amount of people they cut off the line. Bands hang out at their tent through out the day helping sell merch and hanging out.
The pre-sale if you purchased the Alt Press subscription you get to 2 cut of the line passes for Alt Press Tent signings. Meaning you could can cut the line for the signing. Only for Alt Press signings.