I often see people asking how to add images to posts - so here's a brief 'How-To':
I'll assume that you already have the image saved to your device. If you need help with taking screenshots, I suggest you use Google to help you, as the process varies a lot from PC to phone or other devices.
Start by uploading the image to a free cloud hosting service. There are many of these; I use imgbb.com (you don't need to register to use this service) but there are plenty of others, including imgur.com. I've used imgbb to post the images below.
Navigate to https://imgbb.com/ and either: (i) hit the ''Start Uploading' button and select the image you want; or (ii) drag and drop your image onto the screen:
You'll then see the screen below. Hit the upload button to complete the task.
Now you get this screen. Note the dropdown headed 'Embed Codes'. Select 'BBcode full linked', which will display the complete image in your post. There are other options if you just want to show a link or to post a thumbnail.
Copy the BB code; when you hover over the box that contains the code, a 'Copy' button appears. Now paste the code into your post; it shows up like this:
When you save the post, your image appears like this: