That helps a lot! It works much better when I have images, I need a different solution for text though. It would give us 40+ pages if creating a page for each individual popup.. I will have to research that more. Maybe there's a plugin where you can display text only as a popup?
I'm wondering though, when you open the image for the first time, this blue circle-like-thing shows up at the top of the page for a second and then the lightbox opens. I tried searching the forum but couldn't find anything about it – not sure what it is called really And I tried getting a screenshot of it but of course it didn't show now!
Also, I created a lightbox gallery that is triggered by a button, is there a way to add ightbox_caption to that too? I can add the code to the first image which is added with a url, but how do I add it to the gallery images (image "738,737")? (see code below). Also, this gallery seems a bit crazy when you open it, it kinda scrolls the wrong way and always jumps 2 images at the time – stressing me out a bit! haha! I tried adding the first image as the display image but still the same issue.
Sorry for the lengthy message and thanks again for all the support!
[gallery link="file" ids="738,737"]
[lightbox selector=".gallery-item a" thumbnails="true"]
[button class="gallery-item" href="http://6eb.588.myftpupload.com/wp-content/uploads/Quadraus-Lumborum-Muscle.jpg" lightbox_caption="Test Caption 1" title="Example"][x_icon type="play-circle"]Visual of Different Glute Muscles[/button]