Reader:Subscribing to feeds
You can subscribe to RSS feeds using the 'Actions' menu on the web interface.
Just paste the URL to the RSS feed into the popup.
You can enable Firefox integration from the prefrences page. This will add an option to subscribe directly from Firefox.
You can then navigate to the URL of an RSS feed and use the dropdown to subscribe using Tiny Tiny RSS.
To help you find the URL for RSS feeds there's a small plugin for firefox which displays an RSS icon in the URL bar on sites with a feed available. Clicking the icon takes you to the page and provided you've setup Firefox integration you can subscribe easily from there.
If you have the android client installed, you can also use the Android share menu to subscribe to a feed from your mobile browser.