To use your Sandbox, go to your sandbox page ("User:Topazan/sandbox"). To make a userspace article, go to the URL bar, and go to ("User:Topazan/[insert userspace article name here]") and create the article.
To keep track of the sandbox and your user articles, go to your user preferences and activate the following gadgets:
- My Sandbox
- FixedUserbar or FixedUserbar2
Alternatively, you could always leave links to your userspace articles/sandbox on your userpage to easily keep track of them.