Wrong topic for asking 'how to' questions.
But to save you looking about or using the search feature of the forum..
- download the mod
- unzip it, if required
- check to see what files will be altered by the mod by reading the install text file 'carefully', download these from the web server and then copy them so you have a back up
- if any database changes are required make those as detailed in the installation instructions
- make the changes to the files as detailed in the mod installation instructions, once you have altered the files and made any database changes you can upload the altered file to the web server
mod installed. Repeat for all the mods you want to install.