I have a question about WordPress (theme: Twenty Fifteen) that I hope you can help me out with.
I’m aiming to include a block of content (in this case my newsletter sign-up form) in all posts but in different positions on various posts. I need this to be cleverly included somehow as I don’t wanna go though all posts in case I need to change the form to something else in the future.
Yes, you can use plugin for that.There were many plugins avilable for newsletter signin you can use the plugin so you don’t need to go through all posts in case of any changes in future.