Hope you can find answers from the below community thread
How to add a lobby image in IFS so that it will be available for all users | IFS Community

Best Regards

Thank you Mr. Kumara but I can't access the link :(

Check whether the below link accessible
Add image to lobby | IFS Community

otherwise please follow the below steps
 

1. Create a folder (ex: Lobby) in www-root directory in IFS home.
   <ifs_home>\instance\<instance_name>\www-root\lobby
2. Place all the images in that folder.
   You can access those images by using the access point url like below
   http://<application server>:<port>/lobby/a1.jpg
   (example: http://mkevmpe1033.corpnet.ifsworld.com:58080/lobby/a1.jpg )

Thank you very much Mr. Kumara