Can't update iPhoto in my High Sierra MacBook Air
I downloaded an update to my MacBook Air OS from Maverick to High Sierra. Now I've lost iPhoto in my desktop apps. I tried going to Mac App store and they say iPhoto not available. The iPhoto icon shows up on my desktop box but it is greyed out and struck out with a circle and bar and I can't open it. I clicked on it and the message said I have to download an update from the app store. What do I do to get my iPhoto or the equivalent into my MacBook Air apps folder so I can use iPhoto or its equivalent? Please help? I'm kind a dummy when it comes to this stuff so if someone could put it in laymen's terms, that would be just so helpful. Help!
MacBook Air