In order to remember to do regular OKR updates with the team, you need to conduct meetings.

You can find "Meetings" section under the "OKRs" (see "Meetings" collection).
Also, all active (incomplete) OKRs are displayed on the Home page of all goal participants. Using the "check" icon to the left of the OKR's name, you can update its status and complete the goal. The deadline of the OKR is displayed on the right. 
Moreover, you can arrange a meeting straight from the Home page. To do this, click on "Meetings" on top of the page.