my bevel modifiere doesnt work what can i do

You need to describe the problem, post some screenshots, walk us through it.

Keep in mind, we can help out, but it's up to you to make breakthroughs through problems, try to go back and watch the lessons again, start again, so some experiments, it's the only way to learn. 

Yes, a clearer description and maybe one or more screenshots would be helpful, Tristan ttgttristan .

There are a ton of 'mistakes' you can make and it's hard to guess what happens fi you just say: this or that doesn't work.

Let me make a wild guess here: try disabling Clamp Overlap:

Also the Amount may need to be different, as it depends on the scale of your object