How to remove 'posted by x on 'x date' – Intergalactic Theme

I am trying to remove the ‘posted by Adventurist on xx/xx/xx’ above each of my blog posts but I am not having a lot of luck.

I used a browser inspector to see that the CSS class for the date/author phrase is entry-meta. You can hide it by adding this custom CSS:

.entry-meta {
  display: none;
}

I have read a number of other posts but still can’t find the piece I’m supposed to remove, in fact I’m not even sure which section in appearance editor I need to look?

Don’t edit the theme files directly, otherwise your changes will be overwritten whenever the theme is updated.

An easy way to add custom CSS is to install the Jetpack plugin and activate the Custom CSS module. You’ll then add your custom CSS in the new stylesheet editor that’ll appear in your dashboard, under Appearance > Edit CSS.

As alternatives, you could either install a standalone custom CSS plugin, or create a child theme.

PLUS, another function I have been trying to conquer is making a sticky image on the right hand side of my posts, under the title image, (so when you scroll down it follows you – I’m sure you have all seen them!) however there is no right hand sidebar to edit. Does anyone know how I can add a sidebar to add an image to? How would I go about doing this?

That would be a more advanced change requiring adding a new CSS class to each image, and then adding some custom CSS with absolute positioning to make sure your element stays fixed. You can learn more here:

https://css-tricks.com/absolute-relative-fixed-positioining-how-do-they-differ/

You’ll need to do some trial and error until you get the effect you’re after.