1. How can I remove Powered by OrdaSoft!.
In Pro version we haven't that. may be you use some free modules ?
2. The images for categories are repeated, all missed up.
sorry, what you mean., can you show some screenshot. We haven't option in advertisement board set image for category/
. The sh404sef_ext_advertisemen is not working.
For me it work good, Did you install sh404segf component, did you install self plugin ?
4. How can I display list of categories, I followed all your steps but did not work.
Not full understand what you mean, all typesd layouts you may change with help Advertisment board settings