I need to change a checkbox on the Donations page to a box where people can put their own dollar amount in and it will be added to the total at the bottom of the screen. I cannot locate where to go to make that change.
On Amount tab of contribution page (Contributions menu > 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.
Price set: You can create a price set as text field with amount set to 1 and include the price set in contribution page
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)