WELCOME to the "Community.FamiySearch' Forum ...
Short Answer: To the "Memories" 'Tab' of an individual/person ...
On the "Menu" under the "Header" for an individual/person ...
Resulting in ...
[ ps: Old format; but, principle is still the same ... ]
Here is a "Knowledge Article" in 'FamilySearch':
How do I upload memories to FamilySearch
I hope this helps.
Brett’s answer is great.
If you want a photo to appear instead of the pink or blue silhouette you can add a Portrait.
How do I add or change a portrait photo in Family Tree?