Adding text to a text box when multiple checkboxes are marked
I am working on adding text to a text box when multiple checkboxes are marked/selected. I have looked all through the links that have been sent to me and tried several suggested options, but nothing is working for me. (this is why I do not make my living as a code specialist!)
I need for these boxes outlined in Red :

to add text to this box below all at the same time if the box is checked..

I will be doing this same thing from drop down boxes once I have this part with the checkmarks completed.
Thanks in advance for any assistance for this newbie!
