YES, you can edit the task status of the linked task. Please refer below steps to do so;

1. Log in to your Orangescrum account using your credentials.
2. From the left menu, click on “Tasks“.
3. Navigate to the task detail page. This page displays the specific details and information about a particular task.
4. On the task detail page, locate the section “Task Links” related to tasks. 
5. Click on the “Task Links” section and find the Linking Task & Click the status dropdown and change the status. (Refer to Image 1)

(Image 1)