If you are new to Instagram Feed Gallery, by default, the plugin is linked to QuadLayers’ Instagram account:

The feeds you will display are taken from the account or accounts added to Instagram Feed Gallery so the first thing you need to do is delete QuadLayers’ account and add yours.

Here, there are two possibilities:

1) If you are logged-in to Instagram in your browser, the plugin will get this data automatically. 

2) If you are not logged in, you will be redirected to the official Instagram site to log-in:

There, you have to authorize Instagram to access your account. Another alternative is to use your token and connect the app manually as shown below:

If you are using Instagram Feed Gallery PRO version for multiple accounts:

Instagram Feed Gallery PRO allows you to display feeds from different Instagram accounts. To add new accounts, follow these steps:

1. Go to your Instagram account in your browser and log out.
2. Go to the account tab in WordPress and press the Add account button.
3. Then, set a new connection (generate new token) using your credentials from Instagram.

Please note that you must log out from Instagram in your browser before you generate a new token. Otherwise you will get a message saying that your account is already connected.