"Manually" means you have 3 possibilities:
1. Semi-automatic - just fill in the LayDes fields with:
1.1. name of your widget class
1.2. name of your widget instance
1.3 do postioning
2. "pure" manually with theide editor after shortcut "Ctrl_T"
3. manually or programatically with an editor of your choice or awk, ced, gvim etc.