My dear friend , just click on the arrow steem or steem power power and it should give you the option to buy steem . so looking at your steem power if you click on that arrow in front of 792.576 steem , it will give you 2 options, one to buy and one to power down to steem token . and if you click on the right arrow after 127.192 steem , it will give you options to transfer, transfer to steem power, power up, buy or market . I hope that helps . feel free to ask more questions