Install an add-in from the Office Store
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In Outlook, click Home > Store on the ribbon.
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On the Add-Ins for Outlook page, browse for the add-in you want by selecting All and scrolling through the list, or search for an add-in by using the Search box. When you find an add-in you want, review its privacy policy.
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For free add-ins, use the toggle controls to turn them on or off. For paid add-ins and free trials, select Get it to finish your purchase.
Request an add-in not available in Office Store
To request an add-in that is not available in the Office Store, you will need to submit a Support Request ticket, containing the .xml file of the add-in you need.
Use an add-in for Outlook
The add-ins that you have installed automatically appear on your ribbon. For example, this user installed the Translator for Outlook and Reply with eGift add-ins. They appear on the ribbon right next to the Store button.
They also appear on the Message tab when you're reading or composing an email.
Manage your add-ins
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Select the Store button or the Manage add-ins button on your add-ins bar.
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On the Office add-ins page, you can do the following:
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Search for new add-ins.
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Use the options on the toolbar to add more add-ins, uninstall an add-in, or refresh the page to see a list of the latest add-ins.
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Turn an add-in on or off by sliding the toggle switch.
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Select an add-in to see more information about it.
More information is available at Microsoft -- Get an Office Add-in for Outlook