No. You must not make any changes to your will after it has been signed and witnessed. If you write or type on it you may invalidate it. It’s also best to avoid stapling or pinning anything to it, as this could imply there is something missing and raise doubts as to its validity.
The only way to change your will is to either make a new one or add a codicil (which amends your will, rather than replacing it). Like a will, a codicil needs to be properly witnessed to be valid.