Dirt, you first select either decimal or american odds depending on your book. For example, -130 = American and 1.7 = Decimal.
Then select "To Win Amount" and select the number of units you are hoping to win in dollar value, e.g., $10 a unit and 3 units = $30. You put this value in the "Amount" box under "Input Data".
Then enter the lines from your book, again under "Input Data". First you put in the ML Wager Odd, which is the moneyline. Let's take today's Cubs for example. They are -156 today (American odds). You put -156 in this field.
Then put in the -1.5 runline odd. They are +140 today, so just put 140 (no need for plus sign here). The website recognizes this as plus money.
Your Wager #1 will be the moneyline play. Bet that amount.
Your Wager #2 will be the -1.5 runline play. Bet that amount.
Do you notice that the amount to win for Wager #1 and the amount to risk for Wager #2 are the same? That is how you get a push at -1, i.e., if the Cubs win by 1 run.
Then the summary statistics tell you what odds you are getting with your -1 play and the total amount risked.
Feel free to PM with any other questions. Cheers!