What is the correct way to format terms which should be searched for or button names? Example:

1. Search for "Settings"
2. Click on the "System Settings" button

Should an inline code span be used, "quotation marks" or italics?

By my knowledge, inline code is for commands and file paths

What is the correct way to format terms which should be searched for or button names? 
Example:

1. Search for "Settings"
2. Click on the "System Settings" button

Should an inline code span be used, "quotation marks" or italics?

By my knowledge, inline code is for commands and file paths