I'm very new to trading and I am encountering this issue frequently in paper money while trying to learn the software. I start a trade and buy in at market price with a stop limit and stop loss set. When I see indications that the stock will most likely not trend upwards as I had hoped, I attempt to lower the "Stop Limit" to just above my "Buy" price. I get the response that, "Rejected: This stock is not available to borrow. if you want us to try to locate it for you, please call our trade desk." I have attached a screen shot displaying, the purchase price, 50 shares, and the attempted lowering of the stop limit and the rejection popup I receive. Guidance and information will be greatly appreciated.