How to add a logo to the HTML

Hi,
I want to remove the text at the top of the page that says "Power - Professional Joomla Template" and replace with my own logo

I have managed to remove the text by going into Extensions > Modules and then by editing the 'Logo' module using the WYSIWYG editor, however when I click to insert an image, it is asking me for a source.

If I enter the path where the file is saved on my laptop, it won't display the logo. So do I need to upload that file in the FTP panel where my website is hosted?

Please note I am a beginner with Joomla and making websites in general so please don't go too technical on me - thanks.

Hi there,
please read the detailed instructions about the logo and logo-small position of the template.
>> Logo Setup
demo.joomlaplates.com/jp_power/docs/