Microsoft Paint program, Need to mark on "Picture" obtained screenshot

My hand is a bit shaky using the Mouse to mark on the "picture"/"Photograph" obtained using Paint to capture a "PrtSrn" image. The editing "Tools" do not appear to let me mark on the saved image , although I can mark it using the "tools" provided before I saved the image in question. Its a bit rough with a mouse.
I expect I will need some kind of tablet screen and a "pen" to use with it, being able to apply text, copied from Word 2007 Home and Student. would save my shaky hand writing, and be more legible. I have done this in the past following You Tube and How to wilki - using pdf's and pasting patches of text or blanks, but Paint saves images as png (Portable network graphics), this is new to me.
Is their any way I could use my android tablets, galaxcy, Hudl, as an input device with a special "pen" to save buying another piece of kit.
I am forgetful I wish to have a tangible record of my tangled computerised records of what is where concerning documents etc when I leave off half way I have to start again.

Hi dalchina,
No I have only copied youtube to place blank patches on a document index to cover an unwanted section.
I can mark on to the saved screenshot page, but after saving to try and update the file it comes back as before.
similarly I copied your screenshot and saved it Jpeg, and the same happened. marking gets wiped off, back to 1st copy.

Regards, Billz

Suggestion, forget Paint and get hold of paint.net which is a free graphics program, you will be able to use the text tool to write on the images.

Paint.NET - Download

Hi dalchina,
Thank you for the information.

Regards, Billz