Are you trying to use Q2A instead of SMF? If so, there must be a bridge for Q2A in Coppermine Gallery. According to the document below, unfortunately it seems that bridge with Q2A is not supported.
However, Q2A has a single sign-on feature to share users with other system (It is assumed WordPress). This feature is very informative, but I do not know if it can be diverted to systems other than WordPress.
Anyway, I think there is no easy way to solve it.
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.