I have just started using Salesforce (and i LOVE it!) and will be writing little tips about how to do certains things. There are good resources on the salesforce site – but some of the things I will write here I have found it hard to find in their help section.
If you want to change the tabs that you can see when you login to salesforce you need to go to setup (a link on the very top of the page), then click on My personal Information and then you can customize your tabs and related lists. It is a simple proceedure – but as I have been finding with Salesforce – some of the simple things to do are buried under several layers.