Membership payment form: I need to add a level that allows members to pay what they can.

I have several membership levels with set prices, but I need to add a level that allows members to pay what they can.

I assume that you are referring to this form: https://www.jotform.us/form/91885879819181 

You would need to change the payment type to Sell Subscriptions: https://www.jotform.com/help/49-Order-Form-Types

Then, set up your subscriptions: https://www.jotform.com/help/166-How-to-Setup-a-Recurring-Payment-Option

Where you will be able to set one where the user can put a custom amount:

Here is my demo form: https://form.jotform.com/91886118943974

You can clone it if you want to: https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL

Let us know if you need more help, we will be glad to assist you.

New response receivedSorry about neglecting to mention the form, but you did assume correctly
So, if I did that, I could combine set prices for some levels and have an “other” level where the member could put in their own amount?
Also, I was wondering, when the free says it is limited to 10 payments... that is per month or in total?
Thanks for your speedy response!
...

The sell subscription type allows the user to select one subscriptions only, and yes, you can create one where the user can input whatever amount they want to:

In regards to the payments limit, it is a monthly limit, so you can receive up to 10 payments per month in a free plan. The counter resets the first day of each month.

Let us know if you have more questions.

Thank you for the form! I changed this to "yearly."  Does this mean it will renew automatically every year though?  

It is a once a year charge for a one year membership. I really don't want it recurring (though I guess the one-time payment ensures it won't recur?).  I really just want to be extra sure.  I ran it through once as a test, and got the subscribe page, but I just want to be sure it will work as intended.

Yes, "yearly" means that the subscription will be renewed each year, in case that the subscription is configured as "1 payment only" then this will not be renewed. 

So basically all those subscriptions with "one-time payment" label will not be renewed.