This tutorial assumes you are already logged in to your Joomla admin panel
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In order to specify what types of media can be uploaded to your site, you will need to set the allowed file extensions
1) Click Site
 
2) Then Global Configuration
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3) Go to the System settings

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Scroll down
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4) Next to Legal Extensions, enter the file types you want to allow and separate each with a comma

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You can also change the maximum file size and the paths to the media and image folders
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5) If you would like to allow any users to be able to upload files, click No next to Restrict Uploads
 
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Scroll up
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6) Click Save
 
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That's it! You now know how to specify what file extensions can be uploaded in Joomla