To enjoy all benefits of daily signature set-ups, you should:
Make sure you have entered sufficient information for everybody included (users can also add this information themselves on the User page)
The users in Subscription now have a purple box, while the ones in Credit mode an orange one.
Next signature set-up will occur at a time that you can see under the section Time of daily set-up in Subscription settings. You can change the time of the next set-up after this one there, too.
You don't have to wait for the scheduled set-up, you can always set the signatures manually. The details are described in a dedicated article.