EEBO-TCP may be accessed through a number of different websites and platforms, including ProQuest’s EEBO and JISC Historic Books. The University of Michigan and University of Oxford host the EEBO-, Evans-, and ECCO-TCP texts on a platform called DLXS.
The following screencasts may help you make the most of this resource. Although the screencasts were all recorded using EEBO-TCP as an example, the ECCO and Evans platforms work much the same way.
Or, you can watch all of them together.