How to add Scale Bar to an image using ImageJ Software

Is there a way I can put the scale bar next to my image since it's blocking part of the view there?

[fatimayusr]

if i need to put the scale bar in um not in pixels, how can i do that?

[tashmeenkaur]

How to add a scale bar of length say 100 nm or 1 micrometer. How to relate pixels with nm

[onimisibethel]

What I achieved is pixel but I what scale bar in um