I see you joined the forum a few months ago, so it's no surprise you might need a roadmap to help navigate the site.
To send a photo either in a continuation of a thread or as a specific response to one, in the lower left corner is the "Attach Photos" box. I'm an Android guy so I know for sure this process works in that venue - if you are Apple I suspect it's very similar. When you click on the button, it will ask you what you want to upload. Go to your gallery, click on the photo and it will upload to a thumbnail at the bottom of your message. Click on "Insert" then on "Full Image". Now your photo pops up in the thread. Watch where you put the photo, sometimes they interrupt the text making it hard to follow your thoughts. Here is one of my tags, you can tell it's hard to read in spots.
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With fender tags, position matters on the codes. Most codes are 2-5 characters and yes they can become obscure over time. Often these are easier to read in person as opposed to a photo. If your pics are hard to read, it helps with decoding if you clarify that line 2, group three reads as "xxxxx". Groups are read from left to right, and the rows are read from bottom to top.
Here are a couple of other tips. I'm going to send you a PM, shorthand for Personal Message. You will get a notice in your email and on the site. It's used to talk directly to another member (or members) without putting everything in full view. Hit the response icon in your mailbox and it will connect us privately.
Another useful feature is tagging. That's where you page another member to get their attention to a thread. As you spend time here you will realize we are chock full of experts in just about all areas. Maybe you are working on a slant issue and want some specific info. Member RustyRatRod is an expert on slants, but he has no idea what you are doing to see your thread. Tagging gets his attention so he can check out the thread. To do this, just put the @ symbol in front of his screen name, like this.
@RustyRatRod . Get the screen name exact, including spaces and capitalization, and no space between the @ and the name. He will now get a ding on his end to look this up and see I just made him a guinea pig for tagging which will probably cost me a chili dog should our paths ever cross.
Above all don't be shy, and use the search feature to find info you need. All threads are saved so you can see a thread from years ago that can solve your issue. Easy-Peasy.