Make sure you don't purchase any Steem or Steem dollars on poloniex, they have disabled both deposits and withdrawls. You can purchase @bittrex and other exchanges and transfer to your account here on Steemit.com. If you buy Steem on Bittrex for example, when you have the steem in your bittrex account. Goto the wallets tab and check the box that says hide zero balances(makes things less busy looking). Press the litlle "-" button to the left of the Steem name. In the window that opens up, under address put your name on steemit, or "atonyatlaw" without the quotes. Now, in another browser window or tab you will need to go into your steemit.com account, click on your avatar in the upper right corner, and click on wallet. Now you will see your wallet there and you want to click on the "Permissions" tab. Scroll all the way down to the bottom, you need to copy the string of text beside the QRCODE for the last entry titled "MEMO". That string needs to be pasted into the "memo" field at bittrex. Now all you have to do is decide how many of your steem you wish to transfer, if you want to send all of them click the double up arrow on the left of the "quantity" field in the bittrex window. Now VERIFY the address, the amount, the memo field, if you make a mistake here you can send your funds into the abyss so PLEASE verify. Click the Withdraw button. It will ask you to confirm and if you have 2 factor authentication set up(you really should if you haven't yet) it will ask you for your 2fa. That's it, fairly straight forward. This process will be similar on other exchanges, although I have only ever done this from bittrex...

So any posts or replies that you agree with or like, you'll see an up arrow beside the dollar amount located under the post. Click that arrow and it should turn blue. That's how to upvote a post and or comment. Remember the more helpful/relevant your posts/replies/comments are the more likely they are to get upvoted which makes you money.

I hope this was somewhat helpful if so, please upvote this reply, thanks, and welcome to the Steem community...