How do you install Canola? If you did install it; then you know how to install an app and you will install Canola-cleanup the same way! Canola-cleanup exists because uninstalling Canola did not do a good job by itself.

To run it: look for it maybe under "extras" and tap it just like any other app. Just like you run Canola.

If you can not find it anywhere then delete it and then install it again.