The extension reads canvas.asu.edu and any instructure.com address out of the box. Most universities run Canvas on their own address, and LMK reads those too once you add the address under the gear. These are the schools whose Canvas we have checked.
Same steps, one Chrome extension: LMK on Brightspace.
If your Canvas address ends in instructure.com, nothing to add — install and open Canvas once. Otherwise install, open LMK, and choose Add my school's Canvas under the gear; or use the Canvas access-token route there, which works at any school and on a phone (it uses Sync from anywhere, so LMK's server keeps that token, encrypted). Brightspace schools work the same way through brightspace.com.