RubyGems source change

  question, ruby

Ruby download is normal, installation is normal, gem test is normal.图片描述

Because gem foreign Yu’ an source is not useful, I intend to change the source. it is stuck in this step. ① the source can be deleted, but it cannot be added. ② the gemrc file can be searched directly. the source is active but cannot be used图片描述
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(3) manually can add, but also can’t use
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Several sources were changed, but none of them worked.
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Rubychina’s source is httpshttps://gems.ruby-china.org/图片描述