Here are the steps on how can you add Instafeed on your homepage.
1) Go to the Apps -> Instafeed Shoppable Instagram -> Home gallery
2) Copy this code using copy button
3) Go to theme -> Customize
4) Click on Add section
5) Add Custom HTML section/ Add Custom Content Section
If your theme has Custom content then you have to add Custom HTML
and paste the code which you copy on step 2
Now you have to remove the rest of the content block using the remove block button of that perticuler Custom content section
NOTE: Make sure you remove this content block of this Custom Section.
6) Hit the save button now.
7) Now you can easily move the position using these 6 dots