It's just like building up a traditional accumulator really. Simply look at some markets you like  over or under goals and corners, both teams to score, correct score, goalscorers, or even who you think could get carded or have a shot on target, they're all there, just build the bet you want and away you go.

Most sportsbooks make it quite easy.

1
Navigate to your desired game and bet type.
2
Click the "bet cell"
3
The bet will populate in your bet slip.
4
Enter your bet amount.
5
Submit bet.