Pretty much everything to know has been said here by @Heliosurge and @nathank 
To add a bit nonetheless, if you want to hide an element, you can do it with CSS.
This is an excellent resource to start with this kind of modification: Make CSS changes on Your Site
To summarize, you’ll use your browser development tools to find which HTML element to hide and put a display: none; CSS rule on it.
If you want to reorder some elements, it can also be done with CSS. It’s a little bit more advanced, and it will depend on what you want to reorder and the exact order you want.
I give an example here: