"I located and opened rc.xml and I note that in its 2nd and 3rd lines it is said:
"Do not edit this file, it will be overwritten on install
Copy the file to $HOME/.config/openbox""
has been left as is. You can safely ignore it, if as Djohnston says you are using the one which is located in /home/unist/.config/openbox
The block texts you say are ok, but you do not have to add the <keybaord>tags</keyboard>, because they are already there. Use the ones which exist : just by adding
the block texts you need nested just before the ending tag : </keyboard>
In addition, I want to be sure where in the file insert the new lines:
- Should it be after line No. 600 </ applications> ? or
- Should it be before line No. 732 </ applications> ?
No, you copy them at the end of the section starting with <keyboard> before the end tag </keyboard>
Update No. 4:
Should I leave blank lines in between applications blocks? Or no blank lines at all?
I suggest you leave them for the comfort of your sight. Openbox does not care, so it's up to you. And to end with, I suggest you use a good text editor, such as Geany (which is included in Openbox), or Gedit if you prefer it, but not something such as Leafpad. Leafpad displays the texts all in black whereas advanced text editors such as Geany, Gedit, Kwrite... display the content of the files such as xml files or any file containing programs, such as bash, Perl and so on with syntax highlighting, which is much more comfortable for editing.