The SBA is allowing the borrowers that never got a first round of PPP to get it now.
Certain existing PPP borrowers can request to modify their First Draw PPP Loan amount
You should contact your financial institution to know if you can still apply for the 1st round of PPP through them. If their answer is no, we recommend going through Fintech companies, such as Lendio. At the time of this post, Lendio is still accepting applications for the first round of PPP.
Note that if you did not get a first round of PPP, you cannot access the second round as a) SBA loan number and b) dollar amount are required information in the second round PPP application.