XF 1.5 How to put a banner ad next to the forum logo?

XYZ500

Active member
How to put a banner ad next to the forum logo? If an addon is available, please let me know. Otherwise, please instruct how/what to edit.

Example:

xfexample.png

Using Scratch theme so there's more space for the banner.

Example:

eexample.png
 
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