Click on the tab "Federal Materials" and choose "Federal Cases" or one of the Appeals Circuits. Administrative decisions can be found under "Administrative Decisions & Guidance". Resources can be search by citation, party name, full text, etc.
PACER provides access to court dockets and filings such as briefs. Individuals must create their own accounts. PACER charges for its service, however fees are waived if the account is less than $15 per quarter (three months).