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You may have it saved on your desktop, but you might have to search your computer for it. The easiest way is to use a search bar. PC’s will have a search bar in the bottom left, and Macs will have it in the top right. Use the followings steps to open a PDF in Adobe Acrobat.  Click File in the menu bar in the upper-right corner. Click Open in the drop-down menu below "File". Select the PDF you want to open and click Open. Alternatively, you can right-click a PDF file and then select Open With... and then select Adobe Acrobat. It's in the secondary menu bar at the top of the screen. It has a tool that resembles a pink highlighter. It's below "Protect & Standardize" in the Tools menu. It's in the secondary toolbar. This opens a menu bar you can use to search for text to redact. To search only the current document, click the radial button next to "In the current document". To search multiple PDFs, click "All PDF Documents In" and then use the drop-down menu below the option to select a folder containing multiple PDFs you want to redact. Click the radial button next to the search options and then do one of the following steps.   Single word or phrase: Type the word or phrase in the search bar below the options.  Multiple words or phrase: Click Select Words and then type a word or phrase you want to redact in the bar at the top of the menu. Click Add to add a new word or phrase and type it in the bar at the top. Click Ok when you are finished adding all the words and phrases you want to remove.  Patterns:. Use the drop-down menu to select a pattern. You can use patterns to remove phone numbers, credit cards, social security numbers, dates, email addresses. This searches the documents for all instances the text appears. All instances are of the text you search for are displayed in the menu to the left. Click the checkbox next to all instances you want to redact. You can also click Check All above the list to check everything. This marks all the checked instances for redaction. It's in the secondary toolbar that appears at the top of the screen. This confirms that you want to redact the selected items. If you want to remove hidden information from the document. click Yes in the dialogue box. It's in the menu bar at the top of the screen. This permanently removes the items from your document. The file name will be appended with the suffex "_Redacted". To avoid overwriting your original document, click Save As and save your document to another location or another file name.

Summary:
Open Adobe Acrobat. Open your file. Click Tools. Click Redact. Click Mark for Redaction. Click Find text. Select "In the current document" or "All PDF Documents In". Select "Single word or phrase", "Multiple words or phrase", or "Patterns". Click Search & Remove Text. Click the checkbox next to all instances you want to redact. Click Mark Checked Results for Redaction. Click Apply. Click Ok. Click File. Click Save.