To be part of a Mnemonica Project you must be invited. Once you got your invitation via email or push notification:
Log into your Mnemonica account.
On the home page, click on the blue bar with the RSVP message.
A list of invites appears in a pop-up window. Accept (or decline) by clicking on the relative button.
For each accepted invitation, a Project card appears on your dashboard.
At your convenience, to discover the new resources you have now available, check your notifications pop-up.
If you decline an invitation, you'll not be able to access the Projects you were invited to.
NOTE: if you declined an invitation by accident, ask your manager to invite you again.