How do i change the footers of a PowerPoint presentation

[vitoch]

View > Header and footers

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On one of the slides it has one big text box with several logos. They're not text boxes surrounding each logo picture its just one big one surrounding all of them. Im trying to delete and replace some but i can individually do that because the text box covers all the the logo pics not individually. How do i delete and replace specific ones in this situation?

It sounds the logos are:
1. Grouped
Right click and choose Ungroup
2. One big image
If so, it's not possible to manipulate them individually without a program like Photoshop.

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