I'm sorry you're having a problem inserting pictures. You should be able to fit any size picture into your template. Are you editing the template in the desktop version of Microsoft Word on a laptop or desktop computer? If you are using Word on a computer, are you able to locate the SHAPE FILL tool to add your pictures? When you double click the green box, the Shape Format tab should be selected, then click the little arrow next to the Shape Fill tool (looks like a paint bucket), select Picture and then choose a picture from your computer and click Insert.
Your picture should fill the green box (not go over the top of the green box). You can then resize and crop the image if necessary, by following the instructions in the Help Guide included with your purchase (click the Photo, then click the Picture Format tab, then click Crop. Click and drag the photo to move it around within the frame). Using this method means you should be able to fit any size picture into your template.
If you prefer to follow video instructions, here's a link to a video on how to add photos using the Shape Fill tool in Word:
youtu.be/P98fCK-rDTg
Please let me know if the video or help guide don't solve your problem and you still need help adding your pictures.
With thanks,
Matt