Steel marked the start of her tenure by raising the American flag alongside the embassy's Marine Security Guards, calling it "a symbolic and meaningful start" to her time as envoy to the Republic of Korea.
"Returning to Namdaemun Market after so many years brought back so many memories," Steel wrote.
"It is wonderful to rediscover Seoul — a city that is both familiar and new to me."
A day earlier, she posted a photograph taken before the statue of King Sejong at Gwanghwamun, saying the monument reminded her of Korea's legacy of innovation and leadership.
Born in Seoul in 1955 to a family displaced from the North, Steel emigrated to the United States in 1975.
Her arrival on Thursday filled a post that had stood vacant for about a year and a half. Fluent in Korean, she is expected to help reinforce the alliance by bridging the sensibilities of both nations.
Steel, a devout Christian, also attended Sunday worship at Youngnak Presbyterian Church in central Seoul, a congregation founded by refugees from the North that her own displaced parents once attended, according to local media reports.
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