Where do i enter the code for tokens?

[July Fourth]

ah got it, now i have 400 tokens, whats the best way to use them? (i have 1.7m) so maybe stadium ?

No NEVER spend tokens on stadium, buy scouts. Also you don't have to use them all at once, so you could buy some scouts this season and some the next, I'd maybe trade in 25T in for a little in game $ at this stage to bring in the transfer funds needed to buy these scouts, look to buy players with quality that ends 4 or 9, and also aged 22-24, these players last the longest in your team.