Losy Mines of Phandalver: PC not able to roll for damage

First time GM, running LMP on roll 20. When my PCs open their character sheets on roll, and they click on their weapons to roll to hit, it always show two rolls, like they are hitting on a the advantage/disadvantage. Is there a function i need to turn off so it only shows 1 roll? Next, once my PCs have hit, they cannot roll to wound, because, when they try and click on their character sheet, there is no option to roll damage only. Clicking on the weapon just rolls the "to hit" roll again. How do PCs roll for damage on the LMP module? Thanks a lot for any help G.

By default the sheet is set to roll adv/disadv to speed up game play. You can remove this option sheet by sheet using the options: see here (and scroll to general options). You should also be able to update all sheets globally in the sheet default settings accessed from your game page settings option. As for damage, that can also be updated via the above options (enable auto-damage to avoid needing to click to roll) but in the meantime, if you click the weapon name in the attack message it will roll the damage for you.

Dear Ziechael, thanks a bunch. it took a while to find the gear icon to change all those settings, but now it makes sense. 

No worries, glad you got it sorted. It can be quite the learning curve making a switch to digital tools so never hesitate to reach out :) Happy rolling!