What did the February Revolution cause Tsar Nicholas II to do?

It was the February Revolution—which began with a series of protests in Petrograd, ultimately escalating into violent clashes between soldiers and the protesters—that caused Tsar Nicholas II to abdicate his throne. Famously, strikes began on International Women's Day in the city of Petrograd after women rioted, breaking shop windows and taking to the streets in protest against Russian involvement in the First World War and the food shortages which had spread across Russia. The strikes soon became widespread, and unrest became increasingly violent.
Tsar Nicholas offered his abdication in a train car in Pskov. He had been on his way back to Petrograd upon hearing news of the riots, but he never made it back. Instead, representatives of the Duma, the Russian parliament, intercepted his train to tell him that the situation in the city had escalated so badly that they were going to take power into their own hands. Nicholas had little option but to sign his abdication papers as requested.
https://www.smithsonianmag.com/history/abdication-nicholas-ii-left-russia-without-tsar-first-time-300-years-180962503/