Adding an image to my message

I’m flicking on the image icon but nothing happens, I just get brackets with a flashing cursor in between them…is there an issue with me or the site…thanks…ok I see something below.that I didn’t see when replying to a post…I will try and put my query here with the pic…

I have managed to insert the cables but I can’t find where to add the double lines…see pic….i need to put the double black lines on the new cable…I’ve looked in the collections but can’t find it….dunno what they mean but I think I should add them. This is for a solar installation and I’m added a second string of 8 panels.