How do it hide only a single row of my database

<section id="course" class="course-section">
 
       <center><h2 class="course">Course Details</center></h2> 
        <center><table class="regtable"></center>
				<thead>
					<table border='1' align='center' width='100%'>
					<td align=center>ID</td>
<td align=center>Course Name</td>
<td align=center>Price</td>
<td align=center>Description</td></td>
<td align=center>Course Durations</td></td>
<td align=center>Seats Available</td>
<td align=center>Update</td>
<td align=center>Delete</td>
<td align=center></td>
<td align=center></td>
				</thead>
                <tbody>
                <?php foreach($reg_list as $applications) : ?>
                	
					<tr>
					<td align="center">
							<?php echo $applications["ID"] ?>
						
						</td>
						
                	<td align="center">
							<?php echo $applications["Course_Name"] ?>
						</td>
						
						<td align="center">
							<?php echo $applications["Price"]?>
						</td>
						
						<td  align="center">
							<?php echo $applications["Description"]?>
						</td>
						
						<td  align="center">
							<?php echo $applications["Course_Duration"]?>
						</td>
						
						<td  align="center">
							<?php echo $applications["Avail_Seats"]?>
						</td>
						
						<td>
                        	<center><form method="post" action="index.php">
		<input type="hidden" name="ci" value="<?php echo $applications["ID"]; ?>" />
									<input type="hidden" name="action" value="edit" />
									<input type="submit" value="Update" />
								</center></form> 
                        </td>
                        <td>
                        	<center><form method="POST" action="index.php" 
								onSubmit="return ConfirmDelete();">
									<input type="hidden" name="ci" value="<?php echo $applications["ID"]; ?>" />
									<input type="hidden" name="action" value="delete" />
									<input type="submit" value="Delete" />
								</center></form>
                        </td>
						<td>
                        <center>
					<input type="hidden" name="ci" value="<?php echo $applications["ID"]; ?>" />
									<button class="btn1">Hide table</button>
								</center>
						</td>