Hi Khan,
1. Make sure your abap system is already added to solution manager SLD
2. Add the system in SMSY or LMDB as per your solman release and make sure you have created all the products, products versions correctly and RFC connection between your solman and abap system and assign it to a solution.
3. Goto MOPZ, create a new maintenance, select your solution name, it will bring all the systems added to that particular solution.
4. select your system (there are five phases Plan Maintenance, select files, download files, implement and end maintenance
5. select files - calculate automatically or manual selection
6. update options - maintenance or upgrade
7. select os/db dependent files
8. add the files to download basket
9. download files using download manager
10. apply using SPAM or SUM
regards
kartik