Indenting a paragraph within a REM

If I add another paragraph to a rem (using SHIFT/ENTER) how can I indent this second paragraph.

I’ve tried selecting the 2nd paragraph and using TAB but doesn’t indent

Assuming you mean without creating another rem, manually type in four spaces.

Thanks for advice Umnik - yes I do mean without creating another rem.

Typing in four spaces only indents the first line of second paragraph - what I wand is to have the WHOLE paragraph indented?

Any further advice appreciated.