How to buy shares

It looks like I still need lessons in the mechanics of purchasing shares. I thought I had purchased 37 shares in Frontline Ltd. Infact my limit order never executed and I discovered this morning that I still had the cash. Ooops! I placed the order as the share price was shooting upwards on Thursday and obviously my entry price was never reached.

Unfortunately the market has not been kind to me in the meantime. The FRO share price has gone up and the dollar has strengthened (my account is sterling denominated.) So now I have 35 shares instead of 37! More care is required in future methinks!