First, make sure that the API is enabled for your TestRail installation. You can enable it in the administration area in TestRail under Administration > Site Settings > API.

In Assembla, click your avatar at the top of the screen, and then select My Profile. Click Single Sign-On in the left sidebar. Click Connect account next to TestRail to proceed to connect your account.

Assembla prompts you to provide your TestRail instance URL. Click CONNECT once complete.

If you are not yet signed in to TestRail, you receive the login page. After signing in with your TestRail credentials, confirm Assembla authorization.

After accepting, you are redirected back to Assembla where you can see your connected TestRail account listed under the Connected accounts section.
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Note: You can remove a connected account at any time by clicking Disable.

You connected your TestRail account to Assembla and now can log in by simply clicking the TestRail login button below the standard login.

If you have any questions or need assistance. Please email us at support@assembla.com