Step 1: Navigate to https://imgur.com and click "New Post". You only need to create an account or log in if you wish to save your post for later. If you are just fetching a link, you don't need to sign up.
Step 2: Drag and drop your file. You can also upload directly from your file explorer or paste a URL. You can upload more than one image by clicking "+ Add More Images".
Step 3: Right-click anywhere on the image and click "Copy Image Address".
Step 4: Paste the URL you just copied into the body of your post. Highlight it, then click the "Insert Image" button. It should create brackets around your link.
And that's it! You can check if you did it correctly by clicking the "Preview" button at the bottom of the page, next to "Submit".