If you would like to remove the credit card entry on the online sign up page for a membership, do the following!
Click Memberships > Membership Plans
Click on the plan you want to turn that on/off for (or if you're adding a new plan)!
You'll see TWO check boxes.
"Allow Online Signup"
"Allow Online Signup Without Credit Card"
Check them both!
It will result in your Online Sign Up page looking like this for that plan only.
After clicking 'add credit card later', they click Sign Up!
These members will be added into Triib with a default payment method of 'Cash'. These $0 invoices process automatically every month, so they will remain on your Active Member List and will not show overdue.
You will see them on your Newly Joined Report and be alerted via email per usual!