Yeah i mean for the last year or so every time they always give me ups. Only the last 3 times they have me fedex. I'd rather it be ups but that's nothing to do with shipnex i just like ups better. Ups last pickup is 5pm, fedex last pickup is 330pm. It's basically half off the regular rate for either company.
So yeah whatever label prints you just tape it on and drop it off there before the cut off time. It's not shipnex doing the work is just using their discounted account to send.
Don't label anything with live fish or live coral though. I guess shipnex doesn't want live animals shipped or something so they suspend your account if you label the package that way. As long as you don't label it they're none the wiser though.