# FAQ

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<summary>Installation</summary>

* Tutorial is here : [readme](https://support.mailmergehow.com/quickstart/readme "mention")
* **Add-on doesn't seem to be installed successfully / I never get the "addon-installed successfully" popup:** This issue can occur when you sign to Google accounts, and you are not using the principal account for installation. An easy workaround is to open a private window, sign-in to your Google account, then proceed to the installation.
* **After successful installation, Merge for Gmail is not visible in Google Sheets:** Simply refresh Google Sheets, wait for 10 seconds, and it should appear in the menu !

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<summary>Account &#x26; Billing</summary>

We have a dedicated page about account management, billing, subscription cancellation and how to get invoices here : [account-and-billing](https://support.mailmergehow.com/help/account-and-billing "mention")

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