To hire a paid SERP bot first log into your SerpRobot account here.
1) Click the green "Hire A Bot" button in center of your dashboard or the "Manage Your Bots" item in the left menu.
2) Select if you would like a monthly or yearly subscription or a single payment yearly bot.
Now select how many bots capacity you need in the dropdown and click the "Subscribe" button. Each paid bot will be able to update upto 300 keywords per day.