my iPhone won't download the instagram ap

Hello alisonindistress.

Thanks for reaching out to Apple Support Communities. We understand that you can't download Instagram. We will be glad to assist.

First, let's verify the steps taken to download the app: Download apps and games on your iPhone or iPad

Next, check out this resource for issues with downloading apps:

If you can’t download or update apps on your iPhone or iPad

Let us know how it goes.

Cheers.