To use your GitLab repositories with ReleaseHub, choose the "Sign in with GitLab" option. You'll be prompted to authorize ReleaseHub for read/write access to the API.
GitLab authorization
Note that can you authenticate with multiple different source providers (e.g. GitHub and GitLab). If you use the same email address for those providers, you will be able to see a combined view of repositories for all providers, and each integration will appear separately on your user profile page.
multiple integrations