Next to your profile icon on the right is where you find mods in main menu in the top right corner. I hope you find this thread useful random confused player in the future. Because as of right now (unless the anniversary update fixes this issue with another update) if you’re a total noob to the game I daresay you will find it hard to find.
But seriously. It’s way too small. It should be in huge text and clearly seen. Not hidden away.