Hi @cherckez,
Please, i need you to be more detailed than that where exactly in functions.php do i need to add it ?
You can add it anywhere in the functions.php file but it’s better to add it at the bottom of the file and make sure to add it in between the opening and closing PHP tags.
anyway i changed my mind, ive attached the logo i want to add, and i have another question, is it possible to have one logo on the right side of the header and another one on the left side? (i have a multilingual website)
Yes it’s possible to achieve it but for that you will have to develop more custom code as i have developed and shared the code previously.
If you are not a programmer then you can consider hiring a developer from any online job board like https://www.elance.com/r/contractors/q-wordpress/
Regards,
Movin