IPSEC site to site on multiple aws accounts

In the directions for IPSEC Site to Site in AWS how can I handle
AWS and set the access key and secret key to role

How can I deal multiple aws account when there is only space for one access key and secrete or is there another way to connect my multiple accounts?

For pritunl-link the access key would be set on the pritunl-link client using the command shown in that documentation. The key in the Pritunl web console is for the route advertisements on VPN servers. The Pritunl server does not function as a link client. Every link must have at least two locations and one host in each location. The pritunl-link client should not be run on the same instance as a Pritunl server.