As a default rule, multiple member LLCs file tax returns in the same manner as a partnership. A partnership pays income tax by filing an information return with the IRS and the individual partners file a Schedule K-1 on their individual tax returns to show their percentage of the profits/losses of the partnership.
Here is the process:

First, the partnership files an information-only return on Form 1065 and submits it to the IRS; and

Then each partner's share of the profit or loss of the partnership is recorded on a Schedule K-1.

The K-1 information for each partner is reported on Line 17 of the partner's Form 1040.