Yes you can.

How to;

On side bar menu,click on the settings tab as shown below.

Once selected, a drop down menu appears as shown below.

On the menu, select Contributions, then select list contributions as shown below.
The path is Dashboard>Settings>Contributions>List Contributions.

Once selected, a page with all the contributions appears.

Each contribution setting has three buttons alongside it;

1. Edit button: This button allows you to change or update details of a contribution setting.
2. Hide Button: This button hides the contribution setting. However, records pertaining to the hidden contribution remain visible.
3. Delete Button: This button completely deletes a contribution setting together will all records associated with the deleted contribution.

To completely delete a contribution setting, click on the delete button as shown below.

NB: Deleting a contribution setting, will also delete all records associated with that contribution setting.