There is simple way With stellarterm you have to use secret key to enter to access platform offered by stellarterm to make exchange.
It better to go for exchanger get deposit address and deposit your amount of stellar to exchanger.
Follow steps to process :
1) Login to stellar wallet
2) Put deposit address (Tip* Don't forget to mention MEMO)
3) Sell or wait for increase price against BTC
Thanks for the help, I tried to go with that way but I wasn't able to deposit my funds on poloniex exchange using desktop client. I used the proper address and memo id for the transaction but still, the client refused to send the funds. is there any other way?
P.S - I am facing the following issue while sending STR to the poloenix wallet.