In Canvas go to Admin > Developer Keys
Click the +Developer Key button and choose API Key to add a new key
Enter any key name and owner's email address. In the Redirect URI (Legacy) field, enter:
Click Enforce Scope to enable it
There are 9 scopes that need to be enabled. Expand the category for each one to find the scope and click the checkbox to enable it. If you're having a hard time finding a particular scope, there is a search box on the top right that will allow you to copy the scope from this article, paste it, then search.
New Additional Scopes
Verify that all nine scopes are selected and click Save Key
The new entry will be displayed.
Change the state to "ON".
Copy the number above the Show Key button and paste it into Securly Classroom in the Consumer Key field.
Click the Show Key button, copy the value shown, and paste it into the Consumer Secret field.
For the URL, enter the base URL of your Canvas site. This will be the URL in the address bar after you are logged into Canvas up to the point of the first slash. For example, if you log in to Canvas and then see the URL:
http://ec2-33-222-208-11.compute-1.amazonaws.com/login/canvas in the address bar, you should use the base URL of http://ec2-33-222-208-11.compute-1.amazonaws.com.
After entering the values, click the Link button, then authorize the link with Canvas.
Once the sync is complete, Canvas classes should now be visible on a new Canvas Classes tab in Classes. They will be available for selection on Teacher Tools in the Selection box.