::That's fairly easy.  Go to the image, delete the current contents (including the warning template I added) and add the following (cut and paste) 

 {{Non-free use rationale  
 | Description =  
 | Source =  
 | Article =  
 | Portion =  
 | Low resolution =  
 | Purpose =  
 | Replaceability =  
 | Other information = }} 
 {{Non-free architectural work}} 

 ::Fill in all the lines of the Non-free use template and save the results.  That should do the trick.