How to implement a new jar file from an oss notes

I need help on how to replace a jar file from an oss notes with tx se80. The oss notes number is 1590252.

below is the information fron the oss notes;

Goto the workbench (tx se80). Choose internet service webgui. Then goto webgui->sl->mime objects -> applets.

Backup file ws.jar and implement the attached new file ws.jar.

I was able to copy the jar file onto the os but i don't know how to upload the jar file from the oss notes.