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Try the View Source command for items you are having trouble accomplishing.
Right click on any page that has an image posting done in a manner you wish to duplicate. Or for that matter, has any formatting you wish to try and learn.
One of the choices after right clicking is "View Source" which will open a page of text code for that HTML page on your web browser -- in other words, how that page and its code comes across in plain text with the HTML flags.
From post numbers you can (with some study) find your way to the exact image or effect and see the actual code used. Copy and past that code to a notepad or word file for plain text and then modify it for the URL picture you want to post a link to.
Be sure to include the quotes and also to remember that a picture you have on your computer can't be shown -- it must be posted to the web by you or someone else to have a URL address that can be accessed.
Pics are easier than you think, it only requires a few steps.