Hello and greetings to the valued members of that Forum....Oh, Oh, Oh!

Laptop HP Pavilion g6-1b67ca running
knoppix 6.7.1 from USB flash drive.
To solve the issue, I think, I tried all the GUI options under "Add/Remove Panel Items"

I accidentally deleted the launch icons for "Terminal" and "Iceweasel" from the panel and I would like to have them back but I don't know how to do that. Can somebody help me with that, please?