Getting started (ASP 2024 edition)

Hi,
I just created an ASPE profile using asp.keyoxide.org.
Now, i have 2 (noob) questions that does not seems to appears in documentation:

• how can i link my ASPE profile to my old GPG key that is apparently already present in a completely different profile:
  https://keyoxide.org/aspe:keyoxide.org:IZTNOHXXN6566IQ62H2CEP6WNI
  https://keyoxide.org/hkp/2D66AC538376829600486C67C89A2258F68F3C77

• can i link multiple GPG keys to my identity profile?