1. In the top left of the forum click the tab "User Control Panel"
2. On the left side click the tab labeled "Profile"
3. On the left side click the tab labeled "Edit Signature"
4. In there you can paste your link to your chart.

Please use this format below only replacing your information where you see mine.
Code:
[b][color=#FFFF00]MY OUTSIDE RADIATION MONITORING STATION:[/color][/b]
[b][i]South Beloit, Illinois - GMC200 Outside on HEPA air purifier, ground level, facing West. [/i][/b]
[url]http://netc.com/chart/view.php?n=1%3AEB5A139C[/url]