You can renew items borrowed from other Omni partners yourself by logging into “My library account” from the library homepage. There will be a tab on the left-hand side for each University, and you will need to click on each tab to renew items borrowed from that University.
For items borrowed from institutions outside of the Omni consortia, please email ill@uwaterloo.ca and we will reach out to the lending library to see if a renewal is possible.