You were issued a $1905.23 margin call because you ended the trading day below your margin maintenance. Deposit funds or sell stock immediately to cover your margin call.
You can't buy stocks until you resolve your margin call, so we've canceled your open buy orders. In order to fully resolve your margin call, you must close a trading day with a portfolio value above your margin maintenance.
Your margin call amount may change throughout the trading day. You can find your current margin maintenance on your one-day chart in the form of a red, dotted line, and in the Gold Health section of your account screen.