Step 1 - Go here and note the schedule - https://logicmastersindia.com/SM/2022sm.asp
Step 2 - During the active contest periods just go to the respective links and participate. Read our FAQs for more details on participating. General and Online Solving

You can also try out our past Sudoku Mahabharat contests here to get some practice. The most recent ones can also be participated in unofficially instead of just downloading the content.