Can't get past 'Mods to use'

Hello,

I have just downloaded the latest experimental and when trying to create a new world I am unable to get past the mod section. If I press Tab, like the old days, only the mod categories are changed but I can’t get to the World Gen section. I have literally tried pressing every button on the keyboard but still could not figure out how to switch between main tabs. Help me please!

Try using the > and < buttons (shit+. / shift +’).
These are also the buttons you use to switch between the crafting menu tabs and the go up/down stairs in-game.

Oh, great! Thanks a lot!