is 改成was 就可以了.
Finally going to your signature是现分短作时状, 其逻辑主语 I发出动作,所以用现在分词是正确的.相当于时状从: Finally when I went to your signature.
句意:最后当我走到你的签名前,我激动得泪流满面.我的原意是：终于要到你的签名了，我激动得泪流满面。 可以这样造句吗？不能, 前半句应改一下. 改后的句子为: 终于要到你的签名了，我激动得泪流满面。Finally gettingyour signature, I was so excited that my face was covered with tears./Finally I got your signature.I was so excited that my face was covered with tears.