I see Aworka have just made it easier to integrate Mysms into it. If you got some time on your hands and want to send texts from it for free* i'll explain. Previously you needed to contact MySms and get an API key, no more.
Get the Mysms app from the playstore, its free. Thats the correct app to get, not the others on the right.
Follow it through when you install and open it, verify your number and remember your password. It should look like this, you're done nothing more for you to do with the app now.
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In Aworka go into your settings and enable SMS messages, choose MySMS as provider, enter your phone number and enter your MySms password.
Go send a test text.........................
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*Free as in you do not pay for the service, it uses your phones own text allowance. I imagine most of us have unlimited.