It seems like you're having trouble zooming in on images within the Instagram app. Here are a few possible solutions:

1. **Double-tap**: Try double-tapping the image instead of single-tapping. This might allow you to enter an edit mode where you can zoom in and out.

2. **Swipe left/right**: Swipe your finger from left to right or vice versa on the image. This will sometimes trigger a full-screen view with pinch-to-zoom capabilities.

3. **Long press (on some devices)**: On some Android devices, you can long-press on an image and it might automatically enter zoom mode.

4. **Check your Instagram settings**: Ensure that Zoom is enabled within the app's settings. You can find this by going to your profile, tapping the three horizontal lines, then Settings, then Posts, and then "Zoom in" toggle.

If none of these methods work for you, it might be a good idea to check if there are any software updates available for your device or the Instagram app itself. Sometimes, updating the apps can resolve issues like this.