For decomposers, producers, or consumers:
Hover over the more tab. There will be a drop down that will offer both Food Web and Elements of Environment. If you hover over Elements of Environment, there will be a second drop down with Producer Consumer and Decomposer as options. Select the one you desire and repeat for the other two.
For the food web:
Hover over the more tab. There will be a drop down that will offer both Food Web and Elements of Environment. Select Food Web and that will take you to your desired page.