In order to avoid security-related warning messages when switching to secured connection, you may want either to:

Click here to proceed.

Search page:

The search page allows you to submit a query molecule either by writing/pasting the SMILES in the input box, or drawing your molecule in the graphical interface on the right.

You can load examples as shown in the image below.

You can also select the organism in which to make predictions (default human).
Clickable page snapshot