Issue

You cannot enter or edit text in your drawing.

Cause

You may have the MText Editor (MTEXTED) system variable set to something other than NONE/Internal.

Solution

Type MTEXTED in the Command line and press Enter.

When prompted to Enter new value, type a period (.).

The MTEXTED variable should now be set to NONE/Internal, and you should now be able to place or edit text.