Follow the instructions below on How to Install a New Template in WordPress and Configure Main Colors?
So first of all open your WordPress dashboard.
So Here You can see the theme sections. Now We have to add a new Theme so we will click on the add new theme button.
If you have your own theme, you can upload it by clicking on the upload button,
otherwise, you can add any custom theme by clicking on the search button. But I will choose the theme from here. I am choosing The GeneratePress theme but it's not the promotion of this theme. So now we have to click on the install button and wait a few seconds then click on the Active button.
We will now check our website to see if the theme has been uploaded. Now You Can See My Theme has Been Active Successfully.
So Next Step is How To Configure the Main Colors?
First of all, open your WordPress dashboard. Then click on the customize site button.
On the Left Side, you have to click on the colors section.
As you can see these are our Site’s main colors. You can change These Colours from Here. So let me show you How To change the background color. So now we have to click on the background button and choose the color that we want to do.
After selecting the color simply we have to click on the Publish button.
So I check my website to see if the color has changed. As You can see my website Background Colour has been successfully changed. So you can change the colors of other things in the same way.