Pressing the tab key moves the insertion point but by spaces. That is type:
xxx[TAB KEY]yyy
there will be 3 spaces (ASCII 32), not a tab (ASCII 9) between the two text segments
I couldn't find any configuration option for this, but that doesn't mean it's not there
Tabs entered as spaces - MyInfo 7
MyInfo 7 uses a HTML-based text editor, which does not support for variable width tab characters. That's why TAB inserts spaces instead..