Navigation: Self Assessment Module >> Select Client >> Action Menu >> Edit Return >> Edit Return Detail >> Choose Amended Return >> Save
You may click on edit option and then change the return type to amended.
Please refer below screenshot for more help.
PRO TIP: You can copy your previous year return, and make changed to the duplicate return to file an amendment.
Other
To do that follow the below navigation and then continue with the steps above.
Navigation: Self Assessment Module >> Select Client >> Action Menu >> Copy Return