There are several places to obtain help with MNE software tools.
The MNE Forum is a good placed to go for both troubleshooting and general questions.
The Frequently Asked Questions (FAQ) page has some troubleshooting tips, and is a good source of general information. There are also some troubleshooting tips built into the installation page (look for the symbols), and some tips related to 3D plotting problems on the advanced setup page.
If you want to request new features or if you’re confident that you have found a bug, please create a new issue on the GitHub issues page. When reporting bugs, please try to replicate the bug with the MNE-Python sample data, and make every effort to simplify your example script to only the elements necessary to replicate the bug.