As the title says I have a homebrew subclass that i want to use but i can't figure out how to port it over to DnD Beyond. Is there anyone that does commissions for DnD Beyond homebrew?

That's kinda difficult to do.

1. DDB's publishing rules don't allow for someone to publish someone else's work, technically that's strait up plagiarism.
2. Homebrew can't be transferred between accounts. Private homebrew can be shared, but that's only to be used in a character build in any shared campaigns. 
3. DDB's ToS says you can't share accounts, so it would be a violation to log into another person's account for the purpose of building something in the homebrew tool.

The only real options you have is exchanging screenshots or sharing your screen on discord or something and someone tutoring you on how to build it yourself.

Mairondil is quite correct. The only actual way to help is somebody helping/guiding you to make it yourself. 

There's a lot of content available for free, have you tried making a copy of something that has a feature close to what you want so you can get an idea of how it is done? This is literally how we have all learned - making copies, seeing how it was done and experimenting ourselves. 

See the FAQ/Guide for homebrew linked in my signature, or see the links in Mairondil's signature, for guides already written that might also be of help to you.