Article in English: It's at the top of the screen. This places you into form editing mode. Now that you've imported a form, you can edit the existing fields, create new fields, and add other elements like menus and lists. Acrobat attempts to create fields based on the layout of your document. A list of fields appears in the right panel under the "Fields" header. Here are some ways you can change an existing field:  To change the size of a field, click it once so it's surrounded by handles, then drag the handles to the desired size.     To delete a field, click it once to select it, and then press Delete on your keyboard.     See Step 5 for more customization ideas for editing fields. This tool looks like a "T" with a cursor and is in the icon bar above the document. To copy an existing field, right-click the field and select Copy instead.    This places the default sized field at this location. If you'd prefer to draw a box to a specific size, click and drag the mouse cursor to trace the desired size. Once the field is placed, a yellow box will appear. To place a copied field, right-click the desired location and select Paste.    This is just for your own reference and will not be visible on the final version of the form. If you'd like to make filling out this field mandatory, check the box next to "Required field" below the "Field Name" blank.    This new dialog box allows you to edit the field’s appearance and add special options. On the "Text Field Properties" dialog, click through the various tabs to check out ways to format your field.  Click the Options tab to add features like spellcheck, multi-line typing, and character limitations.     Click the Appearance tab to adjust colors and font options.     Click Actions to make the field perform certain functions based on the text that's entered.     Click Close when you're finished making edits to this text area.    The other icons next to the Text Field tool above the document represent other features you can add to the form. Hover your mouse cursor over each of the different...

Summary in Vietnamese:
Nhấp vào trình đơn Tools và chọn Prepare Form (Chuẩn bị biểu mẫu). Chỉnh sửa trường văn bản có sẵn. Nhấp vào công cụ Text Field để thêm trường mới. Nhấp vào vị trí mà bạn muốn thêm trường văn bản. Nhập tên cho trường vào khung "Field Name". Nhấp vào All Properties (Tất cả thuộc tính) để truy cập các công cụ chỉnh sửa dành cho trường dữ liệu. Chỉnh sửa trường văn bản. Thêm các nút, trình đơn và tùy chọn khác.