There are three sections to the donation thank you page :
1) Donation thank you page title - Title of the page
2) Donation thank you page text - Body of the page
3) Donation thank you page continue supporting - Continue Supporting text of the page
These sections can be found and updated in the campaign dictionary. Please follow the below steps:
1) Go to campaigns admin panel
2) Click on the Settings tab and Campaign Dictionary tab under it.
3) Find the above three items in the list.
4) Click on the item to update.
5) Click the Edit button on the pop-up.
6) Make the necessary changes and click Save button in the bottom.
If the dictionary item definition section contains "See site for current definition" please click here for more information.