dwl-2100ap as repeater

hi

i need to share my DSL connection with my friend,as u see there is no LOS,so we brought d-link DWL-2100ap to work as repeater,the problem is i dunno how to set dwl-2100ap,there are several modes WDS,WDS with AP,and Repater with AP.What mode should i select and what are security setting for that mode