Trying to upload a theme

Im trying to upload a downloaded theme to my site, but max upload file size php setting don’t allow me to do that. my file size is 15mb can you help with this please.

If you need to upload a script bigger than the 10MB file size limit, you can usually extract the zip on your own computer and upload the extracted folder to a location in your script installation directory. For example, you can extract and upload Wordpress themes by uploading the folder to the wp-content/themes directory. Uploaders like FileZilla make it easy to drag and drop an entire folder from your computer to your hosting account.