1. Start with the URL to your donation form ex: http://SiteName.com/site/Donation2?df_id=1111&1111.donation=form1
    • Add the following argument to select the user entered donation level: &set.DonationLevel=2222
  2. Where 2222 is the level ID which can be found on the Configure Donation Levels page of the donation form.
    • Add the following argument to select the desired amount: &set.Value=1000
  3. Where 1000=$10 and is the auto populated amount desired in the amount field.
The final result should look something like this
http://SiteName.com/site/Donation2?df_id=1111&1111.donation=form1&set.DonationLevel=2222&set.Value=1000

If the donation level selection is working but the auto popuating of the amount is not, contact support. There is a site-wide parameter that allows you to exclude the ability to pass certain kinds of parameters through the URL for a donation form. By default set.Value is excluded, contact support and ask them to remove "Value" from this site parameter and your hidden input should work as expected.