The buttons depend on what version of MS Office he is using. Assuming Eric is using Powerpoint 2013, he must press the following:
1st Slide: Insert > New Slide > Title Only
2nd Slide: Insert > New Slide > Comparison > Click on "Pictures" icon > Browse > Click selected picture > Insert > Delete text box saying "Click to add title" > Insert another picture using same procedures above > Add captions
3rd slide: Insert > New Slide > Two Content > Click on "Picture" icon > Browse > Click selected picture > Insert 3 more pictures > Click textbox "Click to add title"