Having trouble changing settings on Donations Page
On Amount tab of contribution page (Contributions menu &gt; Manage Contribution Pages, then click Configure next to the page in question) you can either choose price set or other amount section to have text field where people can input there own amount.
See :
https://docs.civicrm.org/user/en/latest/contributions/online-contributions/#amounts-tab
https://docs.civicrm.org/user/en/latest/events/complex-event-fees/#price-sets
Price set:
You can create a price set as text field with amount set to 1 and include the price set in contribution page
OR
Other amount:
On amount tab of contribution page you can choose other amount option and choose if you want donor to donate minimum to maximum X amount.(can leave blank if dont need the restriction)