2 Rearranged answer
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The Shulchan Aruch (Orach Chayim 114:1) states that "We begin saying (in the second beracha) Mashiv HaRuach U'Morid HaGeshem during the Mussaf prayer of the final Yom Tov [of Sukkot (i.e. Shemini Atzeret)] and do not cease until the Mussaf prayer of the first day of Pesach. Here, too, is the Mishnah Berurah digest for se'ifim 1 and 2.Pesach":

מתחילין לומר בברכה שניה משיב הרוח ומוריד הגשם בתפלת מוסף של יום טוב האחרון של חג ואין פוסקין עד תפלת מוסף של יום טוב הראשון של פסח

Here, too, is the Mishnah Berurah digest for se'ifim 1 and 2. The siman goes further and describes what to do in different situations (e.g. if you have made a mistake but have not yet finished the beracha, if you have made a mistake and have already finished the beracha, etc.).

The Shulchan Aruch (Orach Chayim 114:1) states that "We begin saying (in the second beracha) Mashiv HaRuach U'Morid HaGeshem during the Mussaf prayer of the final Yom Tov [of Sukkot (i.e. Shemini Atzeret)] and do not cease until the Mussaf prayer of the first day of Pesach. Here, too, is the Mishnah Berurah digest for se'ifim 1 and 2.

מתחילין לומר בברכה שניה משיב הרוח ומוריד הגשם בתפלת מוסף של יום טוב האחרון של חג ואין פוסקין עד תפלת מוסף של יום טוב הראשון של פסח

The siman goes further and describes what to do in different situations (e.g. if you have made a mistake but have not yet finished the beracha, if you have made a mistake and have already finished the beracha, etc.).

The Shulchan Aruch (Orach Chayim 114:1) states that "We begin saying (in the second beracha) Mashiv HaRuach U'Morid HaGeshem during the Mussaf prayer of the final Yom Tov [of Sukkot (i.e. Shemini Atzeret)] and do not cease until the Mussaf prayer of the first day of Pesach":

מתחילין לומר בברכה שניה משיב הרוח ומוריד הגשם בתפלת מוסף של יום טוב האחרון של חג ואין פוסקין עד תפלת מוסף של יום טוב הראשון של פסח

Here, too, is the Mishnah Berurah digest for se'ifim 1 and 2. The siman goes further and describes what to do in different situations (e.g. if you have made a mistake but have not yet finished the beracha, if you have made a mistake and have already finished the beracha, etc.).

1
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The Shulchan Aruch (Orach Chayim 114:1) states that "We begin saying (in the second beracha) Mashiv HaRuach U'Morid HaGeshem during the Mussaf prayer of the final Yom Tov [of Sukkot (i.e. Shemini Atzeret)] and do not cease until the Mussaf prayer of the first day of Pesach. Here, too, is the Mishnah Berurah digest for se'ifim 1 and 2.

מתחילין לומר בברכה שניה משיב הרוח ומוריד הגשם בתפלת מוסף של יום טוב האחרון של חג ואין פוסקין עד תפלת מוסף של יום טוב הראשון של פסח

The siman goes further and describes what to do in different situations (e.g. if you have made a mistake but have not yet finished the beracha, if you have made a mistake and have already finished the beracha, etc.).