Hoopla Kids Mode is very simple to activate from within the apps or on their website. Once you’re logged into your account, just go into your settings in the upper right. Depending on which device you’re on it can look like  or  . Then click/tap on the Kids Mode toggle switch, and you’re all set.
You can also quickly toggle it on and off, without logging in, by clicking the Kids Mode option on the home page in the top right corner!