You will need some info from them to import them.
How to import or enter your W2,
https://ttlc.intuit.com/community/entering-importing/help/how-do-i-import-or-enter-my-w-2/00/26253
not all workplaces are set up so you can import your W-2. in any event you should have gotten copies from your employer - those that can't be imported need to be entered manually. if you don't have them your choices are to contact your employer to get copies or call the social security administration
By calling 1-800-772-1213, you can use our automated telephone services to get recorded information and conduct some business 24 hours a day. If you cannot handle your business through our automated services, you can speak to a Social Security representative between 7 a.m. and 7 p.m. Monday through Friday. Generally, you’ll have a shorter wait time if you call during the week after Tuesday. If you are deaf or hard of hearing, call our toll-free TTY number, 1-800-325-0778, between 7 a.m. and 7 p.m. Monday through Friday.