Poster Editing and Resolution Enhancement

I need assistance with a poster I've designed in PNG format. The poster is 36 in x 72 in. The required edits are minimal: adding a QR code and a logo. However, I need the resolution significantly improved for print quality and prefer for it to be editable. IF THE LOGO I HAVE ADDED DOES NOT FIT IN WELL OR IS POOR RESOLUTION, IT CAN BE LEFT IN EXISITNG FORMAT IN THE TOP LEFT CORNER.

Requirements:
- Add provided QR code and logo.
- Increase resolution for a 36 in x 72 in poster.
- Deliver final poster in PowerPoint (PPT) format.

Ideal Skills and Experience:
- Proficiency in image editing and resolution enhancement.
- Experience with PowerPoint.
- Attention to detail for accurate logo and QR code integration.