To control everything in Icewm you should have a directory in your home with the name " .icewm ". Inside it you must have some files and directories. If you don't, then the defaults are choosen. Those are in (I think) /usr/share/icewm
Copy the files "toolbar", "preferences" and "menu" from the default place to your home/.icewm. Also, inside it, create two subdirectories with name: " icons " and " themes ". Then edit the original file "toolbar" in your .icewm. You will see that is a correspondence between what you have in the file and what you see on the taskbar. You can put some icons to launch your preferred applications. This is done using three words in each line of "toolbar". The first one is the name that you want for your app. and it should appear as a (yellow) tooltip when the pointer is over the icon. The second word is the name of the icon (next & last mail of this serie). The third word (in fact you can use more than one word) is what you write in a console to launch the app. So you can have, for example: " emacs -fn 9x15 ".
The icons are quite special in Icewm, so I will detail their way in the next mail.
The files "menu" and "preferences" are really self-explanatory, althought "preferences" is quite long and cumbersome to edit. You can install " icepref " that is simpler and nicer to use than doing it by hand.