Step 1- Talk to new 401k administrator to see if the 401k roll-in is allowed. Ask them how to make the check payable and get a roll-over form from them. Ask if anything else is required such as a qualification letter or signature.

Step 2- Call the old 401k administrator and request the rollover to your new plan. They may require a signature from you or an acceptance letter from the new plan. Tell them to send YOU the check made payable to the other intsitution.

Step 3- Put the check and roll-over form in an envelope and send it to the new 401k administrator (unless other instructions are given.)

Contact the 401(k) custodian for the old account. You should have statements from them.