Unable to Edit Code Via Theme Editor in Wordpress

[scnmod]

Hey, I'm unable to save theme function php... Unable to add any code on theme editor option.. Folowing issue given below

[ayush03]

Steps to Edit a File in DirectAdmin File Manager:

1. Log in to DirectAdmin Control Panel
2. Navigate to System Info & Files
   
3. Click on File Manager
4. Click on the Domains directory
5. Click on the Domain name you want to Edit
6. Click on the public_html directory
7. Navigate to the file directory you want to Edit
8. Right-click on the file name and click the Edit option
   
9. Make necessary changes and click the Save File button
   
   That's all you're done!