Cannot find SMD resistors in Altium
Altium 13 features Vaults as a primary means of managing your components. You will need to setup a connection to Altium's Hobart Vault (something like public repository) to access the components. Generic SMD resistors can be found e.g. under Components - Generic \ Resistors \ Basic Surface Mount.

If you want to use older library method you will need to download the 'old style' libraries from Altium Wiki.