It is highly recommended that you use Lightshot in order to take images. It is a downloadable program that is 100% safe and it is incredibly easy to use.
A wonderful tutorial explaining how it works (made by Artix and Cysero) can be viewed below:
If you want to use another image-editing program, I have taken the liberty of posting a few programs below. Feel free to use them if you wish:
Please always remember to read the Image Submission Guidelines before taking an image, and if you have any questions, always ask a wiki staff member. We are always willing to help out other wiki editors who need it, so please don't hesitate to ask.