Can I change the suggested cause?

Once a memorial campaign has been started, you can change the cause by heading to your Memorial Gifts section.

In your Management Dashboard, click on the Memorial Gifts section.
Click "Choose a new cause".
Select your new cause from the cause menu, or enter in the name of the charity you'd like to start a fundraiser for.
At this point, make sure you enter in the relevant information in the requested fields. Your fundraiser will not be active until you enter in this information and click save. You can see that this is an inactive fundraiser due to the yellow banner that alerts you.
Here's what a completed fundraiser looks like: