Open your InDesign document
Go to File > Place
Select the image file you want to add
Click Open
Click on the page to place the image at its default size
Click and drag on the page to draw a frame and place the image inside it
Use the Selection Tool to move the image frame
Use the Direct Selection Tool to adjust the image inside the frame
Resize the frame or image as needed
Use Object > Fitting to fit the image to the frame
Repeat the process to add more pictures