From the Twitter page titled You’re in control with our safety tools:
- Avoid language you don’t want to see by blocking specific words. You can mute terms for any of these time periods: 24 hours, 7 days, 30 days — or for as long as you like. Whatever you mute — words, hashtags, phrases — won’t appear on your Home timeline or in your notifications.
- Muting a conversation stops notifications related to a Tweet you’re mentioned in, without blocking anyone or removing the conversation from your Home timeline.
- No longer want to see Tweets or notifications from someone in your Home timeline without blocking them? You can mute an account — and unmute it — any time.
- Get an extra level of control by filtering the types of accounts you see in your notifications. You decide whether or not you want to see notifications from certain accounts.
Use the link below to read the full instructions on Twitter